Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/mfd/da9052-i2c.c b/drivers/mfd/da9052-i2c.c
new file mode 100644
index 000000000..4094f97ec
--- /dev/null
+++ b/drivers/mfd/da9052-i2c.c
@@ -0,0 +1,223 @@
+/*
+ * I2C access for DA9052 PMICs.
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/mfd/core.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+#ifdef CONFIG_OF
+#include <linux/of.h>
+#include <linux/of_device.h>
+#endif
+
+/* I2C safe register check */
+static inline bool i2c_safe_reg(unsigned char reg)
+{
+	switch (reg) {
+	case DA9052_STATUS_A_REG:
+	case DA9052_STATUS_B_REG:
+	case DA9052_STATUS_C_REG:
+	case DA9052_STATUS_D_REG:
+	case DA9052_ADC_RES_L_REG:
+	case DA9052_ADC_RES_H_REG:
+	case DA9052_VDD_RES_REG:
+	case DA9052_ICHG_AV_REG:
+	case DA9052_TBAT_RES_REG:
+	case DA9052_ADCIN4_RES_REG:
+	case DA9052_ADCIN5_RES_REG:
+	case DA9052_ADCIN6_RES_REG:
+	case DA9052_TJUNC_RES_REG:
+	case DA9052_TSI_X_MSB_REG:
+	case DA9052_TSI_Y_MSB_REG:
+	case DA9052_TSI_LSB_REG:
+	case DA9052_TSI_Z_MSB_REG:
+		return true;
+	default:
+		return false;
+	}
+}
+
+/*
+ * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
+ * gets lockup up or fails to respond following a system reset.
+ * This fix is to follow any read or write with a dummy read to a safe
+ * register.
+ */
+static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
+{
+	int val;
+
+	switch (da9052->chip_id) {
+	case DA9052:
+	case DA9053_AA:
+	case DA9053_BA:
+	case DA9053_BB:
+		/* A dummy read to a safe register address. */
+		if (!i2c_safe_reg(reg))
+			return regmap_read(da9052->regmap,
+					   DA9052_PARK_REGISTER,
+					   &val);
+		break;
+	case DA9053_BC:
+	default:
+		/*
+		 * For other chips parking of I2C register
+		 * to a safe place is not required.
+		 */
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * According to errata item 24, multiwrite mode should be avoided
+ * in order to prevent register data corruption after power-down.
+ */
+static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
+{
+	int reg_val, ret;
+
+	ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
+	if (ret < 0)
+		return ret;
+
+	if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
+		reg_val |= DA9052_CONTROL_B_WRITEMODE;
+		ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
+				   reg_val);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id da9052_i2c_id[] = {
+	{"da9052", DA9052},
+	{"da9053-aa", DA9053_AA},
+	{"da9053-ba", DA9053_BA},
+	{"da9053-bb", DA9053_BB},
+	{"da9053-bc", DA9053_BC},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id dialog_dt_ids[] = {
+	{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
+	{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
+	{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
+	{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
+	{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
+	{ /* sentinel */ }
+};
+#endif
+
+static int da9052_i2c_probe(struct i2c_client *client,
+				       const struct i2c_device_id *id)
+{
+	struct da9052 *da9052;
+	int ret;
+
+	da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
+	if (!da9052)
+		return -ENOMEM;
+
+	da9052->dev = &client->dev;
+	da9052->chip_irq = client->irq;
+	da9052->fix_io = da9052_i2c_fix;
+
+	i2c_set_clientdata(client, da9052);
+
+	da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
+	if (IS_ERR(da9052->regmap)) {
+		ret = PTR_ERR(da9052->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = da9052_i2c_disable_multiwrite(da9052);
+	if (ret < 0)
+		return ret;
+
+#ifdef CONFIG_OF
+	if (!id) {
+		struct device_node *np = client->dev.of_node;
+		const struct of_device_id *deviceid;
+
+		deviceid = of_match_node(dialog_dt_ids, np);
+		id = deviceid->data;
+	}
+#endif
+
+	if (!id) {
+		ret = -ENODEV;
+		dev_err(&client->dev, "id is null.\n");
+		return ret;
+	}
+
+	return da9052_device_init(da9052, id->driver_data);
+}
+
+static int da9052_i2c_remove(struct i2c_client *client)
+{
+	struct da9052 *da9052 = i2c_get_clientdata(client);
+
+	da9052_device_exit(da9052);
+	return 0;
+}
+
+static struct i2c_driver da9052_i2c_driver = {
+	.probe = da9052_i2c_probe,
+	.remove = da9052_i2c_remove,
+	.id_table = da9052_i2c_id,
+	.driver = {
+		.name = "da9052",
+#ifdef CONFIG_OF
+		.of_match_table = dialog_dt_ids,
+#endif
+	},
+};
+
+static int __init da9052_i2c_init(void)
+{
+	int ret;
+
+	ret = i2c_add_driver(&da9052_i2c_driver);
+	if (ret != 0) {
+		pr_err("DA9052 I2C registration failed %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+subsys_initcall(da9052_i2c_init);
+
+static void __exit da9052_i2c_exit(void)
+{
+	i2c_del_driver(&da9052_i2c_driver);
+}
+module_exit(da9052_i2c_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");